Carmit was part of the Pussycat Dolls but in March 2008, she left the group. You can read about her here:
http://en.wikipedia.org/wiki/Carmit_Bachar
And as for the girl that won in Pussycat Dolls Presents: The Search for the Next Dolls, at the end of the show, she said she changed her mind and didn't want to join the group. She said she thought she didn't have the same singing style as the group did, therefore didn't join them. There was nothing in the contract she signed when participating in the TV show that said she had to join the group if she won at the end...